:root{--ink:#17213a;--muted:#61708a;--paper:#f7f8fc;--surface:#fff;--primary:#4057c8;--primary-dark:#30429c;--line:#dce2ee;--good:#08783e;--bad:#bd2c35;--focus:#f4a700;--radius:14px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper);line-height:1.55}*{box-sizing:border-box}body{margin:0;min-height:100vh}.container{width:min(100% - 2rem,68rem);margin:0 auto;padding:2.25rem 0 5rem}.site-header{min-height:4rem;display:flex;align-items:center;justify-content:space-between;padding:.75rem max(1rem,calc((100% - 68rem)/2));background:var(--surface);border-bottom:1px solid var(--line)}.brand{font-size:1.25rem;font-weight:800;color:var(--ink);text-decoration:none}footer{text-align:center;color:var(--muted);padding:2rem}.skip{position:absolute;left:-9999px}.skip:focus{left:1rem;top:1rem;z-index:10;background:#fff;padding:.75rem}a{color:var(--primary-dark)}h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.08;margin:.2em 0}h2{margin-top:2rem}.hero{padding:2.5rem 0}.hero.compact{padding:1.5rem 0}.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;font-weight:800;color:var(--primary)}.book{display:grid;grid-template-columns:minmax(10rem,1fr) 3fr;gap:2rem;padding:2rem 0;border-top:1px solid var(--line)}.book h2{margin:0}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));gap:1rem}.card{display:flex;flex-direction:column;gap:.35rem;background:var(--surface);padding:1.25rem;border:1px solid var(--line);border-radius:var(--radius);text-decoration:none;color:var(--ink);box-shadow:0 4px 16px #1d2a4a0d}.card:hover{border-color:var(--primary);transform:translateY(-2px)}.card small,.hint{color:var(--muted)}.direction-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:1rem}.button,button{display:inline-flex;justify-content:center;align-items:center;border:0;border-radius:9px;padding:.72rem 1rem;background:var(--primary);color:#fff;font:inherit;font-weight:750;text-decoration:none;cursor:pointer}.button:hover,button:hover{background:var(--primary-dark)}.button.large{padding:1.25rem}.secondary,button.secondary{color:var(--ink);background:#e8ecf6}.secondary:hover,button.secondary:hover{background:#dce2ee}.danger{background:#fff0f0;color:var(--bad);border:1px solid #f0c9cc}.success-button{background:var(--good)}.small{font-size:.85rem;padding:.4rem .7rem}.link-button{background:transparent;color:var(--primary-dark);text-decoration:underline;margin-top:1rem}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:4px solid var(--focus);outline-offset:3px}.panel,.notice,.error,.success{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem}.notice{border-left:5px solid #d79000}.error{border-left:5px solid var(--bad);color:#7c161d}.success{border-left:5px solid var(--good)}.login{max-width:30rem;margin:3rem auto}.login form,.panel form{display:grid;gap:1rem}label{display:grid;gap:.35rem;font-weight:700}input,select,textarea{width:100%;border:2px solid #abb5c8;border-radius:8px;padding:.65rem .75rem;background:#fff;color:var(--ink);font:inherit}textarea{min-height:6rem}.admin-title,.vocab-heading,.practice-top{display:flex;align-items:center;justify-content:space-between;gap:1rem}.admin-grid,.form-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(14rem,1fr));gap:1rem}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;background:#fff}th,td{text-align:left;padding:.7rem;border-bottom:1px solid var(--line)}th{background:#eef1f7}td form,.header-form{display:inline}.actions{display:flex;gap:1rem;margin-top:1.5rem}.hidden{display:none!important}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}#question{max-width:48rem;margin:2rem auto}#prompt{font-size:clamp(2rem,7vw,4rem);overflow-wrap:anywhere}.badge{display:inline-block;background:#e8ecff;color:#26398f;border-radius:999px;padding:.3rem .7rem;font-weight:700}#answer-form{display:grid;grid-template-columns:1fr auto;gap:.8rem;align-items:end}#answer-form label{grid-column:1/-1}#answer{font-size:1.4rem}.specials{display:flex;gap:.4rem;grid-column:1/-1}.specials button{background:#e8ecf6;color:var(--ink);min-width:3rem}.feedback{margin:1rem 0;padding:1rem;border-radius:10px;background:#fff}.feedback.correct{border:2px solid var(--good);color:var(--good);font-weight:800}.feedback.wrong{border:2px solid var(--bad)}.feedback-line{font-size:1.2rem;margin:.7rem 0;overflow-wrap:anywhere}.diff{color:var(--bad);text-decoration:underline;text-decoration-thickness:2px;font-weight:800}.answer-correct{border-color:var(--good);color:var(--good);background:#effbf3}dialog{border:0;border-radius:var(--radius);box-shadow:0 20px 80px #0004;max-width:30rem}dialog::backdrop{background:#17213a99}#leaderboard ol{padding-left:2.5rem}#leaderboard li{padding:.35rem}.empty{text-align:center;padding:4rem 1rem}@media(max-width:650px){.book{grid-template-columns:1fr}.admin-title,.vocab-heading,.practice-top{align-items:flex-start;flex-direction:column}#answer-form{grid-template-columns:1fr}button,.button{min-height:44px}}@media(prefers-reduced-motion:no-preference){.card{transition:transform .15s,border-color .15s}}